1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Raspberry Pi 4 firmware reset driver
4  *
5  * Copyright (C) 2020 Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
6  */
7 #include <common.h>
8 #include <dm.h>
9 #include <reset-uclass.h>
10 #include <asm/arch/msg.h>
11 #include <dt-bindings/reset/raspberrypi,firmware-reset.h>
12 
raspberrypi_reset_request(struct reset_ctl * reset_ctl)13 static int raspberrypi_reset_request(struct reset_ctl *reset_ctl)
14 {
15 	if (reset_ctl->id >= RASPBERRYPI_FIRMWARE_RESET_NUM_IDS)
16 		return -EINVAL;
17 
18 	return 0;
19 }
20 
raspberrypi_reset_assert(struct reset_ctl * reset_ctl)21 static int raspberrypi_reset_assert(struct reset_ctl *reset_ctl)
22 {
23 	switch (reset_ctl->id) {
24 	case RASPBERRYPI_FIRMWARE_RESET_ID_USB:
25 		bcm2711_notify_vl805_reset();
26 		return 0;
27 	default:
28 		return -EINVAL;
29 	}
30 }
31 
32 struct reset_ops raspberrypi_reset_ops = {
33 	.request = raspberrypi_reset_request,
34 	.rst_assert = raspberrypi_reset_assert,
35 };
36 
37 static const struct udevice_id raspberrypi_reset_ids[] = {
38 	{ .compatible = "raspberrypi,firmware-reset" },
39 	{ }
40 };
41 
42 U_BOOT_DRIVER(raspberrypi_reset) = {
43 	.name = "raspberrypi-reset",
44 	.id = UCLASS_RESET,
45 	.of_match = raspberrypi_reset_ids,
46 	.ops = &raspberrypi_reset_ops,
47 };
48